公开(公告)号：CA2095216A1

公开(公告)日：1992-05-06

申请号：CA2095216

申请日：1991-10-07

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES G ,  DAVIS WALTER L ,  FERNANDEZ SERGIO ,  PONCE DE LEON LORENZO A ,  SIWIAK KAZIMIERZ

IPC: H04B1/16 ,  H03D7/16 ,  H03J1/00 ,  H04B1/14 ,  H04B5/04

Abstract: A receiver (200) includes an automatic frequency controller that determines the frequency of a receiver signal, and a calculates a frequency error from the received signal. The frequency error is used to calculate a correction factor (316) that is used to adjust the frequency of an oscillator (308) in response to the determined error.

公开(公告)号：CA2004236A1

公开(公告)日：1990-07-25

申请号：CA2004236

申请日：1989-11-30

Applicant: MOTOROLA INC

Inventor： GRANDFIELD WALTER J ,  MITTEL JAMES G ,  DAVIS WALTER L

IPC: H03L7/00 ,  H03B5/04 ,  H03B5/12 ,  H03B5/36 ,  H03D7/00 ,  H03D7/12 ,  H04B1/16 ,  H04B1/26

Abstract: A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.

公开(公告)号：AT153810T

公开(公告)日：1997-06-15

申请号：AT91920195

申请日：1991-10-07

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES G ,  DAVIS WALTER LEE ,  FERNANDEZ SERGIO ,  PONCE DE LEON LORENZO A ,  SIWIAK KAZIMIERZ

IPC: H04B1/16 ,  H03D7/16 ,  H03J1/00 ,  H04B1/14 ,  H04B5/04 ,  H03J7/06

Abstract: A receiver (200) includes an automatic frequency controller that determines the frequency of a receiver signal, and a calculates a frequency error from the received signal. The frequency error is used to calculate a correction factor (316) that is used to adjust the frequency of an oscillator (308) in response to the determined error.

公开(公告)号：AT142805T

公开(公告)日：1996-09-15

申请号：AT91920570

申请日：1991-09-30

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES G

IPC: G08B3/10 ,  H04B1/16 ,  G08B5/22 ,  H03D3/00 ,  H03G5/24

Abstract: A selective call receiver (100) includes a controlled oscillator (134) that generates an output signal (140) from a received signa. The controlled oscillator (134) has an input filter (136) that is controlled by a control signal (132) generated from a reference signal (122). The output signal (140) and the reference signal (122), generated from the received signal, are used to adjust the output of the controlled oscillator (134) to equal the reference signal (122). The control signal (132) controls a controlled filter (142) that filters a second signal (144).

公开(公告)号：CA2004236C

公开(公告)日：1993-11-16

申请号：CA2004236

申请日：1989-11-30

Applicant: MOTOROLA INC

Inventor： GRANDFIELD WALTER J ,  MITTEL JAMES G ,  DAVIS WALTER L

IPC: H03L7/00 ,  H03B5/04 ,  H03B5/12 ,  H03B5/36 ,  H03D7/00 ,  H03D7/12 ,  H04B1/16 ,  H04B1/26

Abstract: A heterodyne stage of a receiver which includes a conventional mixer circuit and local oscillator circuit further includes a differential amplifier circuit which measures the amplitude of the injection signal generated by the local oscillator circuit and controls it precisely to a desired reference level by adjusting the current bias supply to the local oscillator circuit within a banded range to ensure start-up of the local oscillator upon energization and to protect against loss of injection signal under all operating conditions. The differential amplifier circuit provides for a precise amplitude reference setting and sufficient closed-loop gain for controlling the amplitude of the injection signal with a minimum of error between the measured and reference values.

公开(公告)号：CA2107769A1

公开(公告)日：1992-10-09

申请号：CA2107769

申请日：1992-02-20

Applicant: MOTOROLA INC

Inventor： ERHART RICHARD A ,  WILLARD DAVID F ,  MITTEL JAMES G

IPC: H03L7/06 ,  H04L7/033 ,  H04L25/49 ,  H04L27/14

公开(公告)号：SG68663A1

公开(公告)日：1999-11-16

申请号：SG1998000805

申请日：1990-06-04

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER L ,  MITTEL JAMES G

IPC: H04B1/16 ,  H04W52/02 ,  H04W88/02 ,  H04Q3/02

Abstract: A battery saving apparatus selectively supplies power to the receiver functions of a battery powered communication receiver at predetermined time intervals prior to the reception of coded message signal. The selective supplying of power to the receiver functions enables the reception of the coded message signal with the receiver functions being powered prior to and only as long as is required for the receiver functions to stabilize and to enable reception of a coded message signal. The predetermined time intervals for the receiver functions are programmed into a code plug to provide the capability to change the turn-on times when required.

公开(公告)号：CA2083946A1

公开(公告)日：1991-12-05

申请号：CA2083946

申请日：1991-04-08

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER L ,  MITTEL JAMES G

IPC: H04B1/16 ,  H04W52/02 ,  H04W88/02 ,  H04Q7/18

Abstract: A battery saving apparatus selectively supplies power to the receiver functions of a battery powered communication receiver at predetermined time intervals prior to the reception of coded message signal. The selective supplying of power to the receiver functions enables the reception of the coded message signal with the receiver functions being powered prior to and only as long as is required for the receiver functions to stabilize and to enable reception of a coded message signal. The predetermined time intervals for the receiver functions are programmed into a code plug to provide the capability to change the turn-on times when required.

公开(公告)号：CA2053294A1

公开(公告)日：1990-12-30

申请号：CA2053294

申请日：1990-05-29

Applicant: MOTOROLA INC

Inventor： MITTEL JAMES G ,  DAVIS WALTER L

IPC: H04L25/06 ,  H04W52/02 ,  H04W88/02

Abstract: A battery saver type paging receiver includes an improved peak and valley amplitude detection type data limiter section with mode control operation thereof, digital word storage of acquired peak and valley amplitude values, and self tuning capabilities. More specifically, the data limiter section includes a controller for controlling the peak and valley detection circuits to acquire respective peak and valley amplitude values in digital word form in a first operational mode and to hold the peak and valley amplitude digital words in corresponding storage registers in a second operational mode. The controller may transfer the data limiter section into a third operational mode during which the peak and valley digital words may be altered a predetermined count to effect a self-tuning thereof. In one embodiment, the third mode of operation is effected during the transfer between the second and first modes of operation.

公开(公告)号：SG68544A1

公开(公告)日：1999-11-16

申请号：SG1996001785

申请日：1991-04-08

Applicant: MOTOROLA INC

Inventor： DAVIS WALTER L ,  MITTEL JAMES G

IPC: H04B1/16 ,  H04W52/02 ,  H04W88/02

Abstract: A battery saving apparatus selectively supplies power to the receiver functions of a battery powered communication receiver at predetermined time intervals prior to the reception of coded message signal. The selective supplying of power to the receiver functions enables the reception of the coded message signal with the receiver functions being powered prior to and only as long as is required for the receiver functions to stabilize and to enable reception of a coded message signal. The predetermined time intervals for the receiver functions are programmed into a code plug to provide the capability to change the turn-on times when required.